package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RequestMapping("/common")
@RestController
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    //文件上床
    @PostMapping("/upload")
    public R upload(MultipartFile file) {
        //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除
        log.info(file.toString());
        //随机唯一
        String s = UUID.randomUUID().toString();
        //分割图片名称
        String originalFilename = file.getOriginalFilename();
        String substring = originalFilename.substring(originalFilename.lastIndexOf("."));
        //拼接
        String fileName = s + substring;
        //创建一个目录
        File dir = new File(basePath);
        //判断当前目录是否存在
        if (!dir.exists()) {
            dir.mkdirs();
        }
        //将临时文件转存到指定位置
        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return R.success(fileName);
    }

//    文件下载

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {

        try {
            response.setHeader("Content-Disposition",
                    "attachment; filename=" + name);// 强制要求浏览器下载。
            //本地读取流
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            ServletOutputStream outputStream = response.getOutputStream();
            //告知浏览器响应的内容类型
            response.setContentType("image/jpeg");

            //回写流
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }

            //    关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }

}
